Square D HLA36070UO 70A 3-Pole 600 V Circuit Breaker

The Square D HLA36070UO is a robust 70-amp, 3-pole circuit breaker designed to safeguard three-phase electrical feeds up to 600 volts. Built for reliability in commercial and light industrial environments, this breaker delivers coordinated protection across all three hot legs, helping to prevent equipment damage and reduce downtime when faults occur.

• Current rating: 70 A
• Pole configuration: 3-pole
• Voltage rating: 600 V
• Part number: HLA36070UO
• Brand: Square D

Why this 3-pole design matters

In three-phase systems, synchronized protection across all phases is essential. The HLA36070UO ensures that when an overload or fault occurs, all affected legs trip together, preserving system balance and preventing partial energization that can harm motors and equipment. This makes it an ideal choice for protecting feeders that power motors, compressors, and other three-phase loads that demand reliable, coordinated shutdowns.

Ideal use cases

• Three-phase feeders in commercial electrical rooms and industrial panels
• Motor protection for equipment operating on 600 V maximum loads
• Backup protection for panel sections that require consistent phase-coordination

Installation and compatibility guidance

Designed to integrate with Square D panels and compatible enclosures, the HLA36070UO offers a straightforward replacement path for like-for-like protection. When selecting a breaker for your system, ensure the panel’s catalog matches a 3-pole, 70-amp, 600-volt device of the HLA series to maintain proper fit and electrical clearance.

Practical benefits and outcomes

• Protects wiring, conductors, and connected loads from overloads and faults, reducing insulation stress and overheating risks
• Promotes safer startup and shutdown sequences for three-phase equipment
• Supports straightforward serviceability with standard mounting and wiring practices common to Square D accessories

Choose the Square D HLA36070UO for dependable three-phase protection at 70 A and up to 600 V. Its specific combination of amperage, polarity, and voltage rating makes it a precise fit for applications where coordinated phase protection is critical, providing peace of mind for electrical designers and facility teams alike.